What is the principle and scope of use of globe valves, butterfly valves and ball valves?

Globe valve - the valve disc is driven by the valve stem and lifts along the axis of the sealing surface of the valve seat. It mainly includes: valve body, bonnet, disc, stem, packing, gasket and operating device, etc.

Ball valve - a valve whose ball can be rotated 90° around the axis perpendicular to the channel. It mainly includes: the valve body is different according to the ball valve structure, among which there is a one-piece type (only for small diameter); Two-piece:

Left and right valve body; Three-piece type: main valve body and left and right two auxiliary valve bodies; Balls, stems, packings, gaskets and operating devices, etc. Butterfly valve - a valve in which the butterfly plate rotates 90° around a fixed shaft.

It mainly includes valve body, butterfly plate, shaft and operating device. Butterfly valves are widely used in medium and low pressure large-diameter pipelines for transporting water, steam, flue gas and other working conditions due to their compact structure, light weight and fast switching. Butterfly valves are divided into soft seals (rubber, PTFE) and metal hard seals according to the different temperatures used for the medium.

Here are some of the well-known brands recognized in the valve industry, which are widely recognized and have a high reputation. While rankings may vary depending on time and market conditions, the following brands are generally considered to be among the top brands in the valve industry:

The following influential first-line brands of water system valves and industrial valves can be used as a reference, but for reference only: Suzhou Neway Valve, Shanghai Guanlong Valve, Shanghai Qizhong Valve, Sanhua, Chaoda, Shentong, Su Valve, Nanfang, Jiang.

First, the word Yao. The above manufacturers are only estimates and references, and the specific situation may vary or fluctuate at any time due to changes in a series of factors such as changes in the market, the size of the competition pattern, and the stability of product quality. As an indispensable key device in industrial production and civil facilities, the quality and reputation of the valve brand directly affect the satisfaction and trust of users.

These brands are known in the valve industry for their innovative technology, high-quality products and reliability. It is important to note that the market and industry are evolving rapidly, and different rankings may vary depending on time and region. For the most up-to-date ranking information, it is recommended to refer to industry reports, professional organizations or market research data for more detailed and accurate information.

The globe valve is a forced seal valve, so when the valve is closed, pressure must be applied to the disc to force the sealing surface not to leak. When the medium enters the valve six from the bottom of the valve disc, the resistance that the operating force needs to overcome is the friction force of the valve stem and the packing material and the thrust generated by the pressure of the medium, and the force of closing the valve is greater than the force of opening the valve, so the diameter of the valve stem should be larger, otherwise the fault of the top bend of the valve stem will occur. In recent years, after the emergence of the self-sealing valve, the medium flow direction of the globe valve has been changed from the top of the disc to enter the valve cavity, at this time, under the action of medium pressure, the force of closing the valve is small, and the force of opening the valve is large, and the diameter of the valve stem can be reduced accordingly.

At the same time, under the action of the medium, this form of valve is also tighter. China's valve "three to give.""It has been stipulated that the flow direction of the shut-off valve shall be top-down.

When the globe valve is opened, the opening height of the disc is 25% of the nominal diameter 30%, the flow rate has reached the maximum, indicating that the valve has reached the fully open position. Therefore, the fully open position of the globe valve should be determined by the stroke of the disc.

The main characteristics of the ball valve are its compact structure, reliable sealing, simple structure, convenient maintenance, the sealing surface and the spherical surface are often in a closed state, not easy to be eroded by the medium, easy to operate and maintain, suitable for water, solvent, acid and natural gas and other general working media, but also suitable for the medium with harsh working conditions, such as oxygen, hydrogen peroxide, methane and ethylene, etc., which are widely used in various industries. The ball valve body can be monolithic or combined.

Ball valves and globe valves.

Difference 1: How it works.

The closing principle of the globe valve is to rely on the pressure of the valve stem to make the sealing surface of the disc and the sealing surface of the valve seat fit tightly to prevent the flow of medium. China's valve "three to give" has stipulated that the flow direction of the globe valve is all top-down, so there is directionality when installing. The structure length of the globe valve is greater than that of the gate valve, and the fluid resistance is large, and the sealing reliability is not strong during long-term operation.

The ball body of the ball valve is fixed and does not move when pressurized. Fixed ball valves are equipped with floating seats, and after being pressured by the medium, the valve seats move to make the sealing ring press against the ball to ensure sealing. Bearings are usually installed on the upper and lower shafts with the ball, and the operating torque is small, which is suitable for high-pressure and large-diameter valves.

Difference 2: Application field.

The national standard globe valve is a commonly used product in the globe valve series, the API American standard globe valve implements ANSI and API standards, and the sealing surface of the disc and valve seat is made of Stellite cobalt-based cemented carbide with different hardness, which has reliable sealing, high hardness, wear resistance, high temperature resistance, corrosion resistance, good scratch resistance and long life.

In China, ball valves are widely used in petroleum refining, long-distance pipelines, chemicals, papermaking, pharmaceuticals, water conservancy, electric power, municipal, steel and other industries, and occupy a pivotal position in the national economy. It has an action of 90 degrees of rotation, and the body is a sphere, with circular through-holes or channels through its axis.

Difference 3: Installation method.

Attention should be paid to the following matters in the installation and maintenance of the globe valve: 1. The globe valve operated by the handwheel and handle can be installed in any position of the pipeline. 2. Handwheels, handles and micro-moving mechanisms are not allowed to be used for lifting. 3. The flow direction of the medium should be consistent with the direction of the arrow shown on the valve body.

Attention should be paid to the installation of ball valves: 1) Remove the protective covers on both sides of the flange end and rinse and clean the valve when the valve is fully open. 2) Before installation, the whole machine should be tested according to the specified signal (electricity or gas) (to prevent vibration caused by transportation from affecting the performance), and the qualified rear line should be installed (the wiring is according to the circuit diagram of the electric actuator).

3) During installation, please do not use the actuator part of the valve as the lifting point to avoid damage to the actuator and accessories.

What is the difference between a patented ball valve and a globe valve?

1. The material of the valve body is different: the body material of Q41F-16C is cast steel, and the material of Q41F-16P is 304 stainless steel. q stands for Ball Valve (the initial letter of qiu pinyin); 4 represents flange connection; 1 represents a ball valve is a floating ball (the ball valve is divided into a floating ball and a fixed ball, and 7 represents a fixed ball); F stands for PTFE-PTFE seal (PTFE polytetrafluoroethylene); 16 represents the nominal pressure of the ball valve is 16 kg (; C stands for ball valve body material is cast steel, P stands for ball valve body material is 304 stainless steel.

Second, the anti-rust function of the ball valve body is different: because the material of Q41F-16P is 304 stainless steel, it is better than the anti-rust function of Q41F-16C.

3. Adapt to different environments and mediums: the pressure and temperature resistance of Q41F-16P are higher than those of Q41F-16C; Q41F-16C is suitable for general media such as water, and Q41F-16P can be used for acidic media, which is more corrosion-resistant than Q41F-16C.

The <> globe valve has double seal protection, excellent sealing and durability but is not easy to operate, and the ball valve is easy to open and close movement, can be adjusted and throttled. In terms of principle, the globe valve is a forced sealing valve, so it is necessary to apply pressure to the valve disc to ensure that the sealing surface does not leak when using, and the ball valve is a valve with the ball valve as the rotating shaft and the valve stem to drive the opening and closing parts (ball). In terms of characteristics, the double sealing design of the globe valve can ensure that in the case of bellows failure, the stem packing can also avoid leakage events, and has the characteristics of long service life, no fluid loss, and no maintenance.

Ball valves have the characteristics of low fluid resistance, simple structure, small size, light weight, reliability, easy operation, easy maintenance, and wide range of use. In terms of application, globe valves are mainly used in the aerospace field, and their high sealing performance and reliability are of great significance to ensure the safe and reliable operation of aerospace equipment, while ball valves are widely used in petroleum refining, long-distance pipelines, chemicals, papermaking, pharmaceuticals, water conservancy, electric power, municipal, steel and other industries.

There are so many varieties, and their connection is that they are all valves.

Differences: There are many ways to distinguish them, such as whether there is no adjustment function, whether it can be hard sealed, whether the size of the shape is convenient for installation, etc.

Check valve: Its function is to prevent the backflow of the medium in the pipeline.

Gate valves can be made of a large diameter, and the ball valve is generally up to DN200, butterfly valves, globe valves have adjustment functions, but butterfly valves are small in size, fast in opening and closing, cheap in cost and different from globe valves, different working conditions are suitable for different valves

Hello, different working conditions require different valves. It is mainly a control component in the fluid transportation system, with the functions of shut-off, regulation, diversion, prevention of backflow, pressure stabilization, diversion or overflow pressure relief. Take a look at the profiles of each valve. Hope it helps.

It's really hard to say, there are too many varieties, and the valves produced by Shanghai Jiasong have won many awards, so you can go and see if you need to.

Different uses are different. This is not easy to introduce. It's best to go and get a sample and take a closer look.